A shortspear is small enough to wield one-handed. It may also be thrown.

Simple, One-Handed Melee
Cost: 1gp Weight: 4lb
Dmg (S): 1d4, Dmg (M): 1d6, Dmg (L): 1d8, Critical: x2, Piercing
Range Increment: 20 ft.

Source: Player's Handbook

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